It hasn't been quite the marquee opening Turquoise had hoped for this week. The London Stock Exchange on Monday began to move its alternative trading venue onto a new technology provided by the Sri Lankan software vendor MillenniumIT, which it bought last year. The aim was to ramp up the speed and compete head-on with faster rivals. And as this table shows, there was an immediate impact to trading volumes at Turquoise – although unfortunately not in the right direction.

The table, compiled from data by Bats Europe, shows that Turquoise's share of European equities trade more than halved from 4.4% last week to 1.5% on Monday. And Tuesday, was little better, with a share of 1.6%.